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Reports code elements that use non-ASCII symbols in an unusual context.

<p>Example:</p>
<ul>
  <li>Non-ASCII characters used in identifiers, strings, or comments.</li>
  <li>Identifiers written in different languages, such as <code>my<b>С</b>ollection</code> with the
    letter <code><b>C</b></code> written in Cyrillic.</li>
  <li>Comments or strings containing Unicode symbols, such as long dashes and arrows.</li>
</ul>

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